Line bar for crossbar line switches



June 2, 1925. f

- A. c. MAGRATH LI`NE BAR FOR GROS'SBR LINE SWITCHES Filedoct. 15, 1920Patented June 2, 1925.

UNITED.r STATES PATENT OFFICE.

AR'LHUR C. MAGRATH, 0F BROOKLYN, NEW YORK, ASSIGNOR TO VESTERN ELECTRICCOMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

LINE BAR FOR CROSSBAR LINE SWITCHES.

Application filed October 16, 1920. Serial No. 417,428.

To all whom t may concern.'

Be it known that I, ARTHUR C. MAGRATH, a citizen of the United States,residing at Brooklyn, in the county oif Kings, State of New York, haveinvented certain new and useful Improvements in Line Bars for CrossbarLine. Switches, oit which the following is a full, clear, concise, andexact description. n

This invention relates to line switches of the cross bar type adaptedfor use in automatic telephone exchanges for establishing connectionsbetween subscribers lines and trunk lines extending to first selectorswitches. More particularly, the invention relates to line bars for usein cross bar switches.

The present invention has for its object, the provision of a line barwhich may be produced at a relatively low cost and which, at the sametime, is thoroughly reliable in operation.

Line bars made in accordance with the present invention arecharacterized by the absence of any screws, bolts, rivets or the like,in their embodiment. Instead of employing such media, the various metalpart-s of the line bar are assembled together and held in their properrelationship by bein-f ,irmly embedded in molded parts of insulatingmaterial.

The accompanying drawing shows a per-V spective view of an assembledline'bar, some portions being shown in cross section.`

.Parts l, 2, 3 and 4l are flat metal conducting strips, each oit` whichis provided with a plurality 0f lugs 5, the tunctionfof which is to makecontact with terminals yol! the trunk bars which cooperate with theseline bars to establish connections between sub` scribers lines and trunklines. The four conducting strips 1, 2, 3 and 4 are firmly embedded inand insulated from each other by blocks of insulating material 6, 7, 8and 9. Also embedded in each of the end blocks 6 and 9 respectivelyis asupporting elementk in the formof a U-shaped clevis l() which isprovided with apertures 11 for engaging fulcrum pin 12.

The line bar is intended to be pivotally mounted on links 18 lwhich inturn are piv otally mountedl on brackets 14. Electromagnet l5 with itsarmature 16 is adapted to operate the line bar.

For a full description of the functions and method of operation of theline bar,

reference may be had to Patent No. 1,462,047

of July 17, 1923, to J. N. Reynolds.

lVhat is claimed is:

l. In combination, a plurality of parallel metallic strips, supportingelements therefor and a plurality of blocks ot insulating material intowhich said strips and said supporting elements are embedded.

2. In combination, a plurality of conducting strips, supporting elementstherefor and a plurality of insulating blocks 'lor securing saidelements on said strips.

3. In combination, a plurality of parallel and superposed metallicstrips, a set of contacting lugs integrally formed with each of saidstrips, supporting elements therefor, and couplings of insulatingmaterial cast at the ends of said strips for securing said elementsthereto.

4. A line bar comprising a plurality of parallel conducting strips, amolded insulator at each end of said line bar into which the ends ofsaid conducting strips are embedded, and a U-shaped clevis embedded ineach of said insulators, the extremities oit' said clevises projectingoutwardly 'from said insulators.

5. A multiple electrical conductor cour prising a plurality of parallelconductors ARTHUR C. MAGRATH.

